An Ultrasonic Mist Diffuser Oil is designed to be used in an Electric Ultrasonic Mist Diffuser.  These disperse microparticles of non heated water which include very very small particles of essential oils into the air in the form of an ultrafine mist created by the vibrations from an ultrasonic plate inside the water tank.  Some oils are dry and some are greasy, but your Ultrasonic Mist diffusers plate in the water tank will need to be cleaned, this is easily done and must be done regularly.

Ultrasonic Mist Diffuser Oil